Wikipedia on atheism:
Atheism is, in the broadest sense, the absence of belief in the existence of deities.
Now what about deities?
A deity is a supernatural being considered divine or sacred.
Supernatural is an ambiguous term. Many people have proposed that if something really affects our world outside of the universe, assuming the universe is not isolated system, then it still could be explained and not be supernatural, therefore.
That means an atheist is the one who does not believe divine or sacred beings exist. However, sacred, as I see it, is subjective: some people may take something to be sacred and not only beings, while others don't. At the same time existence is considered to be somewhat objective.
As for an analogy, we can replace belief in the existence of deities by another belief in the existence. Say, tasty olives. Does absence of belief in the existence of tasty olives even make sense? There, indeed, are people who find olives tasty.
But why did I choose this example? Answer: it depends on a person what is tasty and what's not. At the same time I count the feeling of sacredness to be feeling as well. Some people lack it and others - don't. There are psychological studies to accept this standpoint as meaningful.
Therefore, it points me towards "personal trait" explanation: people just have this feeling or sacredness or not. It really does not make sense to say "I don't believe tasty olives exist". It makes sense to say "I don't believe there are olives I could find tasty". Same, for me, is with sacred beings. Some people consider other really observable entities to be sacred. It does not makes sense to say those people counted sacred really do not exist. It makes sense to say you don't count them sacred. Don't count anything sacred, whether supernatural or not. But it follows from the definition an atheist actually can consider a really existent (observable, not supernatural) entity be sacred and even worship him/her whatever the rituals are involved in this worship. But I did not see an atheist agreeing with this.
And I do not believe people really misunderstand this. It makes me think the definition of atheism provided by wikipedia is flawed. Indeed, there are persons who do not believe in any unworldly entities, those which do not live in our universe. They call themselves atheists on these grounds. I don't know if it makes sense. From the definition it follows they are right, however, the one who believes in "supernatural" beings also can be an atheist if does not consider them sacred (or divine).
Also, I thought that God is a title, not an object. That means under given definition that atheists don't believe the title of "God" exists.
So, therefore, I think better definition of atheism would be "The rejection of anything to be sacred for self". Then it escapes the paradox of a sacred existing human. This would mean disbelief that anyone can have the title of "God". Or, in stronger sense, belief that no one can have the title of "God". But atheist then still could believe in the title of "God".
Have anyone investigated these issues prior to me or am I doing something new, worthy?